I recently Upgraded our Internet connection which required a Modem upgrade also. The Modem/ Wireless Router is the Cisco DPC 3825. Both XBOX 360's are wired connections to the DPC 3825, one XBOX 360 is Original/White model and the second XBOX 360 is the New Slim Black Model. When both 360's are turned on, the Original XBOX 360 signs in perfectly and stays connected, while the Slim XBOX 360 signs in ,then shortly after Disconnects from XBOX LIVE, when trying to reconnect, it will not reconnect. I have to reboot the Modem to get the Slim Model to connect to LIVE. Then it disconnects again !!
Can some please help !